Sun Country IAD Terminal flies to and from the bustling Washington, D.C. area from its own terminal at Washington Dulles International Airport (IAD). The airline's presence at IAD enables passengers to quickly check in, enjoy a variety of terminal amenities, and easily access their flights. At Sun Country, low-cost air travel options are available to passengers without sacrificing service or comfort. Due to IAD's seamless connections, welcoming atmosphere, and hassle-free experience, Sun Country is a popular choice for both leisure and business travelers.